# How much heat is required to convert 10g of ice at -20°C into steam at 100°C is(specific heat of ice=0.5cal/g-°C?

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#### Explanation

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When

- Ice at
#-20°C# to ice at#0°C# - here it continues to be in the same state i.e. ice and hence heat required is#"mass"xx"specific heat"xx"change in temperature"# Specific heat for ice is#0.5# cal/g-°C. - Then from ice at
#0°C# to water at#0°C# and heat required is#"mass"xx"latent heat"# , this latent heat required is for conversion of each unit mass of substance. From ice to water it is#80"cal per gram"# - Water at
#0°C# to water at#100°C# - here it continues to be in the same state i.e. water and hence heat required is#"mass"xx"specific heat"xx"change in temperature"# Specific heat for water is#1# cal/g-°C. - Then from water at
#100°C# to steam at#100°C# and heat required is#"mass"xx"latent heat"# , this latent heat required is for conversion of each unit mass of substance. From water to steam, it is#540"cal per gram"#

Hence, to find heat is required to convert

first calculate heat required to convert

heat required to convert

heat required to convert

heat required to convert

Hence, total heat required is

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